| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 40°F | 30°F | 3.3" |
| February | 23°F | 42°F | 32°F | 2.7" |
| March | 35°F | 57°F | 45°F | 4.6" |
| April | 44°F | 69°F | 56°F | 6.0" |
| May | 53°F | 76°F | 64°F | 5.0" |
| June | 62°F | 84°F | 73°F | 6.1" |
| July | 64°F | 86°F | 75°F | 4.9" |
| August | 62°F | 86°F | 73°F | 3.0" |
| September | 55°F | 80°F | 66°F | 3.6" |
| October | 44°F | 68°F | 55°F | 4.1" |
| November | 33°F | 56°F | 44°F | 3.5" |
| December | 26°F | 44°F | 35°F | 4.4" |
| Index | Spencer | Indiana | National |
| Air quality index | 42 | 56 | 42 |
| Pollution index | 889,312 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 291 |
| Days with moderate air quality | 72 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Paragon, IN | 467 | 42 | 16.0% |
| Bloomington, IN | 84,691 | 42 | 16.0% |
| Gosport, IN | 1,052 | 42 | 16.0% |
| Stinesville, IN | 323 | 42 | 16.0% |
| Worthington, IN | 1,539 | 42 | 16.0% |
| Spencer, IN | 2,224 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Easton, CA | 2,224 | 60 | 20.0% |
| Ely, IA | 2,224 | 39 | 22.0% |
| Sumner, IA | 2,224 | 39 | 22.0% |
| Granby, MO | 2,224 | 37 | 26.0% |
| Wesson, MS | 2,224 | 44 | 12.0% |
| Spencer, IN | 2,224 | 42 | 16.0% |
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